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The autonomous navigation of unmanned aerial vehicles (UAVs) require a lot of sensing modalities to improve their cruise efficiency. This paper presents a system for autonomous navigation and path planning of UAVs in GPS-denied environment based on the fusion of geo-registered 3D point clouds with proprioceptive sensors (IMU, odometry and barometer) and the 2D Google maps. The contributions of this...
In this paper, the single-stage Maximum Power Point Tracking (MPPT) control strategy for the Aalborg photovoltaic inverter is presented. Aalborg inverter has many advantages, such as high efficiency, wide range of input voltage, minimum voltage drop of the filtering inductors, etc. Nevertheless, it is essentially a “half-bridge” inverter with two input sources, where one source works in MPPT mode,...
Delay and security are both highly concerned in the Internet of Things (IoT). In this paper, we set up a secure analytical framework for IoT networks to characterize the network delay performance and secrecy performance. Firstly, stochastic geometry and queueing theory are adopted to model the location of IoT devices and the temporal arrival of packets. Based on this model, a low-complexity secure...
An extremely low-profile circular patch-ring antenna with omnidirectional radiation patterns is proposed in this paper. By simply introducing a shorting via, the impedance matching of the antenna is improved, where both TM31 mode and TM32 mode are excited efficiently to realize a dual resonance behavior. The designed antenna covers the Wi-Fi band of 2.4–2.48 GHz with the realized gain of over 1.5...
In this paper, a planar helix mobile phased antenna array is proposed for 5th generation communication systems with operating frequency of 28GHz. The proposed array displays circular polarization in the endfire direction. Over 65 degrees of axial ratio beamwidth and 7GHz of axial ratio bandwidth has been achieved in the proposed design. The coverage performance of the proposed phased antenna array...
In this paper, a new method for ranking interval grey numbers to address the challenge in multi-criteria decision making problems with interval grey numbers has been proposed. This new method involves the risk preferences of decision makers. First, we propose a new method to rank the interval grey numbers by comparing the possibility degree or whitened-value. Second, we classify the decision makers...
Over-exposed region detection is commonly used for image editing and other applications such as over-exposure corrections. In broadcasting, over-exposed regions in image/video can be detected and corrected prior to sending them to consumers. However, the current detection of over-exposed regions is sometimes inaccurate. The detected over-exposed regions are susceptible to noise and scattered. In this...
Due to the limited spatial resolution of past and existing satellite altimeters, only about 15% of global reservoirs (by storage capacity) can be monitored from space. To estimate the storage variations of more reservoirs via satellite observations, a 3-step algorithm using Moderate Resolution Imaging Spectroradiometer (MODIS) images in combination with the Digital Elevation Model (DEM) from the Shuttle...
The quantized feedback controller is investigated for networked control systems with network delay, quantization and data packet loss. Firstly, the packet dropout, network delay and quantization are considered simultaneously, the random variation of packet dropout is illustrated by Markov chain. Then the network system is described by Markov jump system, the influence of the quantization error can...
In order to improve the attack effect from the top of maneuver target for air-to-ground missile, three-dimensional proportional navigation model with over-gravity compensation is established based on the relative motion equations. Three-dimensional ballistic trajectory of the missile attacking target is simulated based on the guidance and control closed-loop circuit. The effect of the over-gravity...
In the previous studies, it has been shown that the steady-state operation of a class-E resonant inverter can be rapidly simulated in the frequency domain by extending the concept and mathematical form of electrical impedance. This paper provides a more comprehensive solution for the efficient simulation of practical class-E resonant inverter, which is driven by a MOSFET switch. The parasitic components,...
For the non-stationary characteristics of vibration signal and fuzzy characteristics of feature parameter, a method based on EMD-fractal dimension and FCM is proposed for feature extraction and pattern recognition of diesel engine mechanical fault. Firstly decompose vibration signal by EMD, choose IMFs can reflect fault characteristic information better according to the correlation factor, and compute...
Local binary pattern (LBP) has limitation in extracting the edge and direction information, which is vital to infrared face recognition. A new infrared face recognition algorithm fusion of LBP and histogram of oriented gradients (HOG) is proposed. First, LBP operator is adopted to extract the texture feature of an infrared face, and then the edge features of the original infrared face are extracted...
IoT systems have gained increasing attentions in research community and industry. Tens of billions of devices are now connected to the Internet and quintillion bytes of data are generated from sensing devices every day. One of the important applications of IoT systems in industry is monitoring, fault detection, and diagnosis of manufacturing systems (MFDM). However, current practices in the development...
This paper proposes a method of constructing an antenna array on the typical ground plane of the modern mobile terminal. An IFA and a slot in a metal frame antenna elements have been used to illustrate the proposed method. The radiation pattern of the element is recorded at the chosen number of the discrete locations on the ground plane. Antenna elements at the positions, where the boresight is similar...
This work investigates the antenna mutual coupling effect on multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems with oscillator phase noises. Since the antenna correlation when taking the mutual coupling effect into account is smaller than that when the mutual coupling effect is omitted, it is shown that, at small antenna separations, the error rate performance...
A compound frequency selective surface (FSS) with quasi-elliptic band-pass response is presented in this paper. The proposed FSS element is implemented using metallic via holes in a multiplayer structure which includes two dielectric layers and three metal layers. The designed FSS element is easy to fabricate and shows a band-pass response over the frequency range from 24GHz to 26GHz. When the insertion...
Autonomous driving has gained increasing attention and achieved significant successes. To enable autonomous driving, a vehicle needs to collect sensor data and process them in real-time to derive a perception model of the surrounding environment. Driving control decisions are derived based on the perception model. However, the semantics of the perception model are relatively primitive. Some additional...
This paper studies the construction of 3D temperature distribution reconstruction system based on the binocular visual technology. First of all, since the thermal infrared camera is only sensitive to temperature, the traditional calibration method cannot be directly used in it. Therefore, the paper designs a thermal infrared camera calibration board to complete the calibration of the thermal infrared...
Due to the existence of nonlinear, multi-variable coupled of internal mismatch and wind of external disturbances, the Extension control is designed to fulfill the auto-tuning of control parameters for pitch, roll and yaw angle. Building Matlab simulation model to verify the control effect of the Extension controller, and programming GUI monitoring interface on three-dimensional trace and attitude...
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